Chair arm



FIG. 1 is a perspective view of a chair arm embodying the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is an opposite end view thereof; and,

FIG. 6 is a left side or outside view thereof.

The broken lines are for illustrative purposes and form no part of the claimed design. 

The ornamental design for a chair arm, as shown and described. 